<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let head = { glasses: 1 };
      let table = { pen: 3, __proto__: head };
      let bed = {
        __proto__: table,
      };
      let pockets = { money: 2000, __proto__: bed };

      console.log(pockets.glasses);
      console.log(head.glasses); // 快
    </script>
  </body>
</html>
